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National days, ongoing national weeks and months, and global observances for December 20, 2026. Plus historical events and birthdays.
These observances run for a full week; this calendar day falls inside the week.
These observances last the full month; this date is part of that month-long celebration.
Showing the first 12 on this date; there are more month-long observances. See the full months list for December.
International and other global observances on this date (may include days, weeks, or months).
Events that occurred on December 20 throughout history
France transfers the authority of 828,000 square miles of land over to the United States completing the sale of the Louisiana Purchase.
The U.S. Patent Office issued the first patent No. 488,494 to Alexander T. Brown and George Stillman of Syracuse, NY for a pneumatic vehicle tire that "readily and easily detached from or applied to the rim of a wheel."
Directed by Frank Capra, It's a Wonderful Life, premieres in New York City. Starring James Stewart, Donna Reed, and Lionel Barrymore, the perennial Christmas film earned four Oscar nominations.
Dr. Bernard Kouchner and several Paris journalists founded Doctors Without Borders.
President Donald Trump signed legislation creating the United States Space Force. December 20th Celebrated Birthdays
